Improvement in steam-boilers



y UNITED STATES PATENT OFFICE.

IMPROVEMENT IN STEAM-BOILERS.

Specication forming part of Letters Patent No. 13,425, dated August 14,1855.

To ctZZ whom it may concern.-

Be it known that I, J. J. DUTCHER, of the city and county of New Haven,and State of Connecticut, have invented certain new and usefulImprovements in Boilers for Locomotives and other Steam-Engines and forother Purposes; and I do hereby declare that the following is a full,clear, and exact description of the same, reference being had to theaccompanying drawings, forming part of this specification, in which-Figure l is a central longitudinal vertical section of the body andsmoke-box of a locomotive-boiler constructed according to my invention.Fig. 2 is a transverse section of the same in the line a; of Fig. l.Fig. 3 is a transverse section of the same in the lineg/ y of Fig. l.

Similar letters of reference indicate corresponding parts in the severalgures.

A is a horizontal cylinder, forming the eX- terior of the body of theboiler extending from the tire-box to the smoke-box B in the same manneras the external cylinder of the common locomotive-boiler.

C D are two horizontal cylinders of similar diameter, smaller than A,and arranged end to end within it. The cylinder C is united with thetire-box of the boiler by the hollow frustum of a cone u, of which thebase connects with the cylinder C, and the truncated end opens into thefire-box. At the opposite end this cylinder D contains the hollowfrustum of a cone b, the base of which unites with the end of thecylinder and the truncated end with an inclined descending pipe c, whichpasses through the upper side of the cone a. The end of the cylinder Dnearest to C is connected to the base of a hollow frnstum of a cone cZ,which enters into the cone l) in such manner that a space e is leftbetween the two cones. The other end of the cylinder D contains thehollow frustum of a cone f, the base ot the said cone uniting with thecylinder and the truncated end uniting by a pipe g with the truncatedend of the cone CZ.

There is a communication between the cylinders C and D through a pipe orpassage h, which connects the lower sides of the cones b CZ; and fromthe cylinder C there is a passage Z through the conefand the head t' tothe smoke-box b. The smoke or inflammable gases and heated products ofcombustion pass from the fire-box through the cone a, cylinder C,passage h, cone d, cylinder D, and

passage Z to the smoke-box. The water circulates around the cone d andcylinder C, through the pipe c, between the cones e and CZ,l through thepipe g, and passage Z, and around the cylinder D, having a completecirculation both through and around the lines.

In order to form cavities in which the iniam mable gases may be arrestedand burned, I cut holes or leave in the sides of the cylinders C and D,and cover the said holes with long cupsjj, the insides of the cups beingtoward the interior of the cylinders, and in order further to increasethe heating-surface I make other openings which I cover with other cupsZt la, the inside or cavity of which is next the water-space, and theeX- terior enters the interior of the cylinders. From the sides of thecone a small conical chambers m m enter the water-space, and similarcones n n enter the water-space from the head t' of the boiler, and fromthe sides of the cone f cones fm m', of an opposite character to m and nto contain water, enter the flue. The cones m andn serve the samepurposes as the cups jj, and the cones m m serve the same purpose as thecups lo 7c. At the bottom ot' the cylinder D there is a segment-shapedwater-chamber 0 (see Figs. l and 3) entering the said cylinder. Thisserves to check the drat't at the bottom and throw it around the upperpart of the cylinder D and conef before it can escape at the passage Zto the chimney.

By experiments with a boiler of this kind and a tubular boiler of thekind ordinarily used for locomotives I lind that steam is raised in thisboiler in a much shorter time and with a much less quantity of fuel.

Vhat Iclaim as my invention, and desire to secure by Letters Patent, is-

l. Placing within the cylindrical waterbody B of a boiler one or morecylindrical flues C or D, terminating at their ends in frustnins ofcones, which frustums all have the truncated ends toward the fire-boxand the bases toward the chimney and serve to form communication throughthe cylinders from the fire -boX and toward the chimney, substantiallyas herein set forth.

2. The arrangement of the two cylinders C D, cones ct b d f, pipes c g,passages h and Z, as herein fully described. s

' J. J. DUTCHER.

Witnesses:

J. W. MANSEIELD, J QHN C. HOLLISTEEI

